CN102167659B - Method for realizing vacuum rectification and vacuum evaporation of bisphenol A by liquid ring vacuum pump - Google Patents

Method for realizing vacuum rectification and vacuum evaporation of bisphenol A by liquid ring vacuum pump Download PDF

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Publication number
CN102167659B
CN102167659B CN 201110073299 CN201110073299A CN102167659B CN 102167659 B CN102167659 B CN 102167659B CN 201110073299 CN201110073299 CN 201110073299 CN 201110073299 A CN201110073299 A CN 201110073299A CN 102167659 B CN102167659 B CN 102167659B
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vacuum
liquid
liquid ring
liquid phase
rotary pump
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CN102167659A (en
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范洪明
盛小裕
蔡红卫
何雪飞
江铃
万荣波
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Nantong Xingchen Synthetic Materials Co Ltd
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Nantong Xingchen Synthetic Materials Co Ltd
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Abstract

The invention discloses a method for realizing vacuum rectification and vacuum evaporation of bisphenol A by a liquid ring vacuum pum. A liquid ring vacuum pump system is used in a vacuum rectification and vacuum evaporation unit required by producing the bisphenol A. The method forms the vacuum of a unit required by producing the bisphenol A by the liquid ring vacuum pump, so that the defect of the prior art is overcome, and the method is simple to operate; the running of the vacuum pump can not be influenced even that a gas phase which enters into the liquid ring vacuum pump has a small quantity of liquid or the temperature of the temperature of gas phase material is high, so that the faults such as equipment is stuck and the like can be avoided, and the production can be continuously maintained; the equipment can be made of corrosion-resistant stainless steel, so that the equipment can not be corroded, and the long-period running of the equipment is guaranteed; and the method does not need to consume vapor and does not produce phenol-contained wastewater, so that matched recovery technology and equipment can be avoided.

Description

Realize the method for dihydroxyphenyl propane rectification under vacuum and vacuum-evaporation with liquid-ring vacuum pump
Technical field
The present invention relates to the method for a kind of dihydroxyphenyl propane rectification under vacuum and vacuum-evaporation.
Background technology
In dihydroxyphenyl propane was produced, some operation need to be carried out under vacuum condition, such as the rectifying under the vacuum condition and evaporation, on technique in the past, vacuum is by adopting Roots vaccum pump or vapor jet pump to produce, although this can both satisfy on the technique the requirement of vacuum tightness, all has defective or deficiency.
For Roots vaccum pump, entering in the gaseous phase materials of vacuum pump can not entrained liquids, can not carry the impurity of molecule etc. secretly, otherwise cause between the equipment Roots stuck, when entering the gaseous phase materials excess Temperature of lobe pump, because the gap is less between Roots, the as easy as rolling off a log Roots's of appearance expanded by heating gap reduces and the fault of killing, lobe pump can't be worked, thereby can not guarantee the steady and continuous production of whole device or unit, and, owing to Roots's expanded by heating reason, concerning Roots, can not the whole stainless material that adopts corrosion-resistant requirement, domestic technique is to add stainless steel coating on the Roots surface at present, this coating in use may split away off, this can bring equipment corrosion, although state's external enwergy with Roots with the corrosion-resistant stainless steel manufacturing, overseas equipment is expensive.
Concerning vapor jet pump, need to adopt steam to form vacuum, owing to enter in the gaseous phase materials in the vacuum pump and carry the light constituents such as a small amount of water, phenol secretly, after the water cooler cooling through vapor jet pump, steam is transformed into water, phenol is dissolved in the water thereupon, has formed the waste water solution that contains Low Concentration Phenol.This phenolic wastewater need to be processed by the absorption of the polymeric adsorbent that is equipped with in the adsorber, polymeric adsorbent needs to use the desorbing agent desorption after absorption is saturated, and need process matched therewith that desorbing agent is recycled, this technique relative complex, and, adopt vapor jet pump to bring the steam consumption of some amount.
Summary of the invention
The liquid-ring vacuum pump form that the object of the present invention is to provide a kind of more suitable dihydroxyphenyl propane to produce, make the use of vacuum pump more can satisfy processing requirement, and simple to operate, and need not to consume steam, also need not supporting treatment unit for waste water, realize dihydroxyphenyl propane rectification under vacuum and vacuum-evaporation.
Technical solution of the present invention is:
A kind of method with liquid-ring vacuum pump realization dihydroxyphenyl propane rectification under vacuum and vacuum-evaporation is characterized in that: produce at dihydroxyphenyl propane and use the liquid ring vacuum pump system in required rectification under vacuum and the vacuum-evaporation unit; Described liquid ring vacuum pump system comprises the rotary pump with liquid ring that is connected with the gas-phase feed pipe, rotary pump with liquid ring is connected with the liquid phase separating tank, the liquid phase separating tank is connected with the liquid phase cools device, the liquid phase cools device is connected with rotary pump with liquid ring, one end of gas phase pipeline is connected with the liquid phase separating tank, the other end of gas phase pipeline is connected with the gas-phase feed pipe, and phenol liquid upflow tube is set on the liquid phase separating tank; Divide at liquid phase and to add working fluid-phenol in the flow container, and phenol entered in liquid phase cools device and the rotary pump with liquid ring by gravity flow, start rotary pump with liquid ring, liquid phase phenol is by liquid phase separating tank and liquid phase cools device and rotary pump with liquid ring foundation circulation, ingress at rotary pump with liquid ring forms vacuum, progressively open the valve on the large gas phase feed-pipe, namely required vacuum unit is produced vacuum, if the vacuum tightness of required unit is excessive, it is the too high vacuum of the excessive formation of rate of air sucked in required, then open from liquid phase and divide Self controlling valve on the gas phase pipeline that flow container out returns rotary pump with liquid ring, by the automatic control of this Self controlling valve, realize vacuum operating and control that dihydroxyphenyl propane is produced rotary pump with liquid ring in the required unit.
The present invention forms the vacuum of required unit in the dihydroxyphenyl propane production with liquid-ring vacuum pump, to remedy the deficiencies in the prior art, simple to operate, even if enter and carry a small amount of liquid in the gas phase in the liquid-ring vacuum pump secretly, or the gaseous phase materials temperature is when high, do not affect the operation of vacuum pump, can not cause the faults such as equipment is stuck, still can continue to keep production, and equipment can adopt corrosion resistant stainless material, can not bring corrosion to equipment, ensured the long-term operation of equipment, and do not need to consume steam, do not produce phenolic wastewater, thereby do not need supporting recovery Processes and apparatus.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the structural representation of one embodiment of the invention liquid ring vacuum pump system.
Embodiment
A kind of method with liquid-ring vacuum pump realization dihydroxyphenyl propane rectification under vacuum and vacuum-evaporation is produced use liquid ring vacuum pump system in required rectification under vacuum and the vacuum-evaporation unit at dihydroxyphenyl propane; Described liquid ring vacuum pump system comprises the rotary pump with liquid ring 1 that is connected with gas-phase feed pipe 5, rotary pump with liquid ring is connected with liquid phase separating tank 2, the liquid phase separating tank is connected with liquid phase cools device 3, the liquid phase cools device is connected with rotary pump with liquid ring 1, one end of gas phase pipeline 4 is connected with the liquid phase separating tank, the other end of gas phase pipeline is connected with the gas-phase feed pipe, and phenol liquid upflow tube 6 is set on the liquid phase separating tank; Divide at liquid phase and to add working fluid-phenol in the flow container, and phenol entered in liquid phase cools device and the rotary pump with liquid ring by gravity flow, start rotary pump with liquid ring, liquid phase phenol is by liquid phase separating tank and liquid phase cools device and rotary pump with liquid ring foundation circulation, ingress at rotary pump with liquid ring forms vacuum, progressively open the valve 7 on the large gas phase feed-pipe, namely required vacuum unit is produced vacuum, if the vacuum tightness of required unit is excessive, it is the too high vacuum of the excessive formation of rate of air sucked in required, then open from liquid phase and divide Self controlling valve 8 on the gas phase pipeline that flow container out returns rotary pump with liquid ring, by the automatic control of this Self controlling valve, realize vacuum operating and control that dihydroxyphenyl propane is produced rotary pump with liquid ring in the required unit.
Service condition 1: the phenol after the building-up reactions that will produce from dihydroxyphenyl propane-dihydroxyphenyl propane solution, wherein: water: 0.7-1.7%, phenol: 75-85%, dihydroxyphenyl propane: 15-25%, sending into absolute pressure under the vacuum condition is the rectifying tower operation of 15-20KpA, this component will be by concentrate after by rectification under vacuum, there is no in phenol after the concentrate-dihydroxyphenyl propane solution that water exists, bisphenol A concentration is brought up to 20-28%, and each corresponding concentration of component is: water :≤0.1%, phenol: 70-80%, dihydroxyphenyl propane: 20-28%.
Service condition 2: will be from the phenol in above-described embodiment after the rectification under vacuum 1-dihydroxyphenyl propane solution, its concentration is: water :≤0.1%, phenol: 70-80%, dihydroxyphenyl propane: 20-28%, send under the vacuum condition with in the steam-heated falling-film evaporator (one-level evaporation), in the 12-18KpA(absolute pressure), under the 135-145 ℃ condition, can be with the concentration value of this solution concentrate to arts demand.Corresponding concentration is: water-nothing, phenol: 25-30%, dihydroxyphenyl propane: 60-70%.

Claims (1)

1. the method with liquid-ring vacuum pump realization dihydroxyphenyl propane rectification under vacuum and vacuum-evaporation is characterized in that: produce at dihydroxyphenyl propane and use the liquid ring vacuum pump system in required rectification under vacuum and the vacuum-evaporation unit; Described liquid ring vacuum pump system comprises the rotary pump with liquid ring that is connected with the gas-phase feed pipe, rotary pump with liquid ring is connected with the liquid phase separating tank, the liquid phase separating tank is connected with the liquid phase cools device, the liquid phase cools device is connected with rotary pump with liquid ring, one end of gas phase pipeline is connected with the liquid phase separating tank, the other end of gas phase pipeline is connected with the gas-phase feed pipe, and phenol liquid upflow tube is set on the liquid phase separating tank; Divide at liquid phase and to add working fluid-phenol in the flow container, and phenol entered in liquid phase cools device and the rotary pump with liquid ring by gravity flow, start rotary pump with liquid ring, liquid phase phenol is by liquid phase separating tank and liquid phase cools device and rotary pump with liquid ring foundation circulation, ingress at rotary pump with liquid ring forms vacuum, progressively open the valve on the large gas phase feed-pipe, namely required vacuum unit is produced vacuum, if the vacuum tightness of required unit is excessive, it is the too high vacuum of the excessive formation of rate of air sucked in required, then open from liquid phase and divide Self controlling valve on the gas phase pipeline that flow container out returns rotary pump with liquid ring, by the automatic control of this Self controlling valve, realize vacuum operating and control that dihydroxyphenyl propane is produced rotary pump with liquid ring in the required unit.
CN 201110073299 2011-03-25 2011-03-25 Method for realizing vacuum rectification and vacuum evaporation of bisphenol A by liquid ring vacuum pump Active CN102167659B (en)

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103554432B (en) * 2013-11-01 2015-07-22 南通星辰合成材料有限公司 Method for producing bisphenol A novolac epoxy resin through BPA (bisphenol A) heavy ends
CN104056464B (en) * 2014-07-02 2015-08-05 南通星辰合成材料有限公司 The method realizing bisphenol-A steam stripping unit vacuum with liquid-ring vacuum pump is sprayed with steam
CN104083888B (en) * 2014-07-03 2016-06-08 聊城煤武新材料科技有限公司 The processing method that a kind of octanol rectification under vacuum is produced
CN109096115A (en) * 2018-07-02 2018-12-28 赵杰 A kind of methyl ethyl carbonate preparation process
CN112684675B (en) * 2020-12-30 2023-02-21 浙江启尔机电技术有限公司 Vacuum system and immersion lithography machine using same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86102529A (en) * 1986-10-06 1988-04-20 上海染料化工二厂 Process for preparing polycarbonate-grade bis phenol a by ion
CN1318044A (en) * 1998-09-16 2001-10-17 通用电气公司 Liquid vacuum pump seal to reduce contamination bisphernol-A

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86102529A (en) * 1986-10-06 1988-04-20 上海染料化工二厂 Process for preparing polycarbonate-grade bis phenol a by ion
CN1318044A (en) * 1998-09-16 2001-10-17 通用电气公司 Liquid vacuum pump seal to reduce contamination bisphernol-A

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